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      <!-- 编写一个函数，计算两个数字的和、积 要求：使用传参的形式 function test(a,b,type){ -->
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            function fn(a,b,c,d){
                if(c="+"){
                    e=a+b;
                }
                if(d="*"){
                    f=a*b;
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                console.log(e);
                console.log(f);
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            fn(5,6,"+","*")
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